@electric-sql/y-electric/dist/cjs/index.cjs.map

YJS network provider for ElectricSQL

{"version":3,"sources":["../../src/index.ts","../../src/y-electric.ts","../../src/local-storage-resume-state.ts","../../src/utils.ts"],"sourcesContent":["export * from './y-electric'\nexport * from './local-storage-resume-state'\nexport * from './utils'\nexport * from './types'\n","import * as encoding from 'lib0/encoding'\nimport * as decoding from 'lib0/decoding'\nimport * as awarenessProtocol from 'y-protocols/awareness'\nimport { ObservableV2 } from 'lib0/observable'\nimport * as env from 'lib0/environment'\nimport * as Y from 'yjs'\nimport {\n  GetExtensions,\n  isChangeMessage,\n  isControlMessage,\n  Message,\n  Offset,\n  Row,\n  ShapeStream,\n  ShapeStreamOptions,\n} from '@electric-sql/client'\nimport {\n  YProvider,\n  ResumeState,\n  SendErrorRetryHandler,\n  ElectricProviderOptions,\n} from './types'\n\ntype AwarenessUpdate = {\n  added: number[]\n  updated: number[]\n  removed: number[]\n}\n\nexport class ElectricProvider<\n  RowWithDocumentUpdate extends Row<decoding.Decoder> = never,\n  RowWithAwarenessUpdate extends Row<decoding.Decoder> = never,\n> extends ObservableV2<YProvider> {\n  private doc: Y.Doc\n\n  private documentUpdates: {\n    shape: ShapeStreamOptions<GetExtensions<RowWithDocumentUpdate>>\n    sendUrl: string | URL\n    getUpdateFromRow: (row: RowWithDocumentUpdate) => decoding.Decoder\n    sendErrorRetryHandler?: SendErrorRetryHandler\n  }\n\n  private awarenessUpdates?: {\n    shape: ShapeStreamOptions<GetExtensions<RowWithAwarenessUpdate>>\n    sendUrl: string | URL\n    protocol: awarenessProtocol.Awareness\n    getUpdateFromRow: (row: RowWithAwarenessUpdate) => decoding.Decoder\n    sendErrorRetryHandler?: SendErrorRetryHandler\n  }\n\n  private _connected: boolean = false\n  private _synced: boolean = false\n\n  private resumeState: ResumeState\n  private sendingPendingChanges: boolean = false\n  private pendingChanges: Uint8Array | null = null\n  private sendingAwarenessState: boolean = false\n  private pendingAwarenessUpdate: AwarenessUpdate | null = null\n\n  private documentUpdateHandler: (\n    update: Uint8Array,\n    origin: unknown,\n    doc: Y.Doc,\n    transaction: Y.Transaction\n  ) => void\n  private awarenessUpdateHandler?: (\n    update: AwarenessUpdate,\n    origin: unknown\n  ) => void\n\n  private exitHandler: () => void\n  private unsubscribeShapes?: () => void\n\n  private fetchClient?: typeof fetch\n\n  /**\n   * Creates a new ElectricProvider instance that connects YJS documents to Electric SQL.\n   *\n   * @constructor\n   * @param {ElectricProviderOptions} options - Configuration options for the provider\n   * @param {Y.Doc} options.doc - The YJS document to be synchronized\n   * @param {Object} options.documentUpdates - Document updates configuration\n   * @param {ShapeStreamOptions} options.documentUpdates.shape - Options for the document updates shape stream\n   * @param {string|URL} options.documentUpdates.sendUrl - URL endpoint for sending document updates\n   * @param {Function} options.documentUpdates.getUpdateFromRow - Function to extract document update from row\n   * @param {SendErrorRetryHandler} [options.documentUpdates.sendErrorRetryHandler] - Error handler for retrying document updates\n   * @param {Object} [options.awarenessUpdates] - Awareness updates configuration (optional)\n   * @param {ShapeStreamOptions} options.awarenessUpdates.shape - Options for the awareness updates shape stream\n   * @param {string|URL} options.awarenessUpdates.sendUrl - URL endpoint for sending awareness updates\n   * @param {awarenessProtocol.Awareness} options.awarenessUpdates.protocol - Awareness protocol instance\n   * @param {Function} options.awarenessUpdates.getUpdateFromRow - Function to extract awareness update from row\n   * @param {SendErrorRetryHandler} [options.awarenessUpdates.sendErrorRetryHandler] - Error handler for retrying awareness updates\n   * @param {ResumeState} [options.resumeState] - Resume state for the provider\n   * @param {boolean} [options.connect=true] - Whether to automatically connect upon initialization\n   * @param {typeof fetch} [options.fetchClient] - Custom fetch implementation to use for HTTP requests\n   */\n  constructor({\n    doc,\n    documentUpdates: documentUpdatesConfig,\n    awarenessUpdates: awarenessUpdatesConfig,\n    resumeState,\n    connect = true,\n    fetchClient,\n  }: ElectricProviderOptions<RowWithDocumentUpdate, RowWithAwarenessUpdate>) {\n    super()\n\n    this.doc = doc\n    this.documentUpdates = documentUpdatesConfig\n    this.awarenessUpdates = awarenessUpdatesConfig\n    this.resumeState = resumeState ?? {}\n\n    this.fetchClient = fetchClient\n\n    this.exitHandler = () => {\n      if (env.isNode && typeof process !== `undefined`) {\n        process.on(`exit`, this.destroy.bind(this))\n      }\n    }\n\n    this.documentUpdateHandler = this.doc.on(\n      `update`,\n      this.applyDocumentUpdate.bind(this)\n    )\n    if (this.awarenessUpdates) {\n      this.awarenessUpdateHandler = this.applyAwarenessUpdate.bind(this)\n      this.awarenessUpdates.protocol.on(`update`, this.awarenessUpdateHandler!)\n    }\n\n    // enqueue unsynced changes from document if the\n    // resume state provides the document state vector\n    if (this.resumeState?.stableStateVector) {\n      this.pendingChanges = Y.encodeStateAsUpdate(\n        this.doc,\n        this.resumeState.stableStateVector\n      )\n    }\n\n    if (connect) {\n      this.connect()\n    }\n  }\n\n  get synced() {\n    return this._synced\n  }\n\n  set synced(state) {\n    if (this._synced !== state) {\n      this._synced = state\n      this.emit(`synced`, [state])\n      this.emit(`sync`, [state])\n    }\n  }\n\n  set connected(state) {\n    if (this._connected !== state) {\n      this._connected = state\n      if (state) {\n        this.sendOperations()\n      }\n      this.emit(`status`, [{ status: state ? `connected` : `disconnected` }])\n    }\n  }\n\n  get connected() {\n    return this._connected\n  }\n\n  private batch(update: Uint8Array) {\n    if (this.pendingChanges) {\n      this.pendingChanges = Y.mergeUpdates([this.pendingChanges, update])\n    } else {\n      this.pendingChanges = update\n    }\n  }\n\n  destroy() {\n    this.disconnect()\n\n    this.doc.off(`update`, this.documentUpdateHandler)\n    this.awarenessUpdates?.protocol.off(`update`, this.awarenessUpdateHandler!)\n\n    if (env.isNode && typeof process !== `undefined`) {\n      process.off(`exit`, this.exitHandler!)\n    }\n    super.destroy()\n  }\n\n  disconnect() {\n    this.unsubscribeShapes?.()\n\n    if (!this.connected) {\n      return\n    }\n\n    if (this.awarenessUpdates) {\n      awarenessProtocol.removeAwarenessStates(\n        this.awarenessUpdates.protocol,\n        Array.from(this.awarenessUpdates.protocol.getStates().keys()).filter(\n          (client) => client !== this.awarenessUpdates!.protocol.clientID\n        ),\n        this\n      )\n\n      // try to notifying other clients that we are disconnecting\n      awarenessProtocol.removeAwarenessStates(\n        this.awarenessUpdates.protocol,\n        [this.awarenessUpdates.protocol.clientID],\n        `local`\n      )\n\n      this.awarenessUpdates.protocol.setLocalState({})\n    }\n\n    // TODO: await for events before closing\n    this.emit(`connection-close`, [])\n\n    this.pendingAwarenessUpdate = null\n\n    this.connected = false\n    this.synced = false\n  }\n\n  connect() {\n    if (this.connected) {\n      return\n    }\n    const abortController = new AbortController()\n\n    const operationsStream = new ShapeStream<RowWithDocumentUpdate>({\n      ...this.documentUpdates.shape,\n      ...this.resumeState.document,\n      signal: abortController.signal,\n    })\n\n    const operationsShapeUnsubscribe = operationsStream.subscribe(\n      (messages) => {\n        this.operationsShapeHandler(\n          messages,\n          operationsStream.lastOffset,\n          operationsStream.shapeHandle!\n        )\n      }\n    )\n\n    let awarenessShapeUnsubscribe: () => void | undefined\n    if (this.awarenessUpdates) {\n      const awarenessStream = new ShapeStream<RowWithAwarenessUpdate>({\n        ...this.awarenessUpdates.shape,\n        ...this.resumeState.awareness,\n        signal: abortController.signal,\n      })\n\n      awarenessShapeUnsubscribe = awarenessStream.subscribe((messages) => {\n        this.awarenessShapeHandler(\n          messages,\n          awarenessStream.lastOffset,\n          awarenessStream.shapeHandle!\n        )\n      })\n    }\n\n    this.unsubscribeShapes = () => {\n      abortController.abort()\n      operationsShapeUnsubscribe()\n      awarenessShapeUnsubscribe?.()\n      this.unsubscribeShapes = undefined\n    }\n\n    this.emit(`status`, [{ status: `connecting` }])\n  }\n\n  private operationsShapeHandler(\n    messages: Message<RowWithDocumentUpdate>[],\n    offset: Offset,\n    handle: string\n  ) {\n    for (const message of messages) {\n      if (isChangeMessage(message)) {\n        const decoder = this.documentUpdates.getUpdateFromRow(message.value)\n        while (decoder.pos !== decoder.arr.length) {\n          const operation = decoding.readVarUint8Array(decoder)\n          Y.applyUpdate(this.doc, operation, `server`)\n        }\n      } else if (\n        isControlMessage(message) &&\n        message.headers.control === `up-to-date`\n      ) {\n        this.resumeState.document = {\n          offset,\n          handle,\n        }\n\n        if (!this.sendingPendingChanges) {\n          this.synced = true\n          this.resumeState.stableStateVector = Y.encodeStateVector(this.doc)\n        }\n        this.emit(`resumeState`, [this.resumeState])\n        this.connected = true\n      }\n    }\n  }\n\n  // TODO: add an optional throttler that batches updates\n  // before pushing to the server\n  private async applyDocumentUpdate(update: Uint8Array, origin: unknown) {\n    // don't re-send updates from electric\n    if (origin === `server`) {\n      return\n    }\n\n    this.batch(update)\n    this.sendOperations()\n  }\n\n  private async sendOperations() {\n    if (!this.connected || this.sendingPendingChanges) {\n      return\n    }\n\n    try {\n      this.sendingPendingChanges = true\n      while (\n        this.pendingChanges &&\n        this.pendingChanges.length > 2 &&\n        this.connected\n      ) {\n        const sending = this.pendingChanges\n        this.pendingChanges = null\n\n        const encoder = encoding.createEncoder()\n        encoding.writeVarUint8Array(encoder, sending)\n\n        const success = await send(\n          encoder,\n          this.documentUpdates.sendUrl,\n          this.fetchClient ?? fetch,\n          this.documentUpdates.sendErrorRetryHandler\n        )\n        if (!success) {\n          this.batch(sending)\n          this.disconnect()\n        }\n      }\n      // no more pending changes, move stableStateVector forward\n      this.resumeState.stableStateVector = Y.encodeStateVector(this.doc)\n      this.emit(`resumeState`, [this.resumeState])\n    } finally {\n      this.sendingPendingChanges = false\n    }\n  }\n\n  private async applyAwarenessUpdate(\n    awarenessUpdate: AwarenessUpdate,\n    origin: unknown\n  ) {\n    if (origin !== `local` || !this.connected) {\n      return\n    }\n\n    this.pendingAwarenessUpdate = awarenessUpdate\n\n    if (this.sendingAwarenessState) {\n      return\n    }\n\n    this.sendingAwarenessState = true\n\n    try {\n      while (this.pendingAwarenessUpdate && this.connected) {\n        const update = this.pendingAwarenessUpdate\n        this.pendingAwarenessUpdate = null\n\n        const { added, updated, removed } = update\n        const changedClients = added.concat(updated).concat(removed)\n        const encoder = encoding.createEncoder()\n\n        encoding.writeVarUint8Array(\n          encoder,\n          awarenessProtocol.encodeAwarenessUpdate(\n            this.awarenessUpdates!.protocol,\n            changedClients\n          )\n        )\n        const success = await send(\n          encoder,\n          this.awarenessUpdates!.sendUrl,\n          this.fetchClient ?? fetch,\n          this.awarenessUpdates!.sendErrorRetryHandler\n        )\n        if (!success) {\n          this.disconnect()\n        }\n      }\n    } finally {\n      this.sendingAwarenessState = false\n    }\n  }\n\n  private awarenessShapeHandler(\n    messages: Message<RowWithAwarenessUpdate>[],\n    offset: Offset,\n    handle: string\n  ) {\n    for (const message of messages) {\n      if (isChangeMessage(message)) {\n        if (message.headers.operation === `delete`) {\n          awarenessProtocol.removeAwarenessStates(\n            this.awarenessUpdates!.protocol,\n            [Number(message.value.client_id)],\n            `remote`\n          )\n        } else {\n          const decoder = this.awarenessUpdates!.getUpdateFromRow(message.value)\n          awarenessProtocol.applyAwarenessUpdate(\n            this.awarenessUpdates!.protocol,\n            decoding.readVarUint8Array(decoder),\n            this\n          )\n        }\n      } else if (\n        isControlMessage(message) &&\n        message.headers.control === `up-to-date`\n      ) {\n        this.resumeState.awareness = {\n          offset: offset,\n          handle: handle,\n        }\n        this.emit(`resumeState`, [this.resumeState])\n      }\n    }\n  }\n}\n\nasync function send(\n  encoder: encoding.Encoder,\n  endpoint: string | URL,\n  fetchClient: typeof fetch,\n  retryHandler?: SendErrorRetryHandler\n): Promise<boolean> {\n  let response: Response | undefined\n  const op = encoding.toUint8Array(encoder)\n\n  try {\n    response = await fetchClient(endpoint!, {\n      method: `PUT`,\n      headers: {\n        'Content-Type': `application/octet-stream`,\n      },\n      body: op,\n    })\n\n    if (!response.ok) {\n      throw new Error(`Server did not return 2xx`)\n    }\n\n    return true\n  } catch (error) {\n    const shouldRetry = await (retryHandler?.({\n      response,\n      error,\n    }) ?? false)\n    return shouldRetry\n  }\n}\n","import { ResumeState, ElectricResumeStateProvider } from './types'\nimport { ObservableV2 } from 'lib0/observable.js'\nimport { ElectricProvider } from './y-electric'\nimport * as buffer from 'lib0/buffer'\n\n/**\n * A ResumeStateProvider implementation using LocalStorage.\n * This is a reference implementation that can be used as a starting point\n * for implementing other ResumeStateProviders.\n */\nexport class LocalStorageResumeStateProvider extends ObservableV2<ElectricResumeStateProvider> {\n  private key: string\n  private resumeState?: ResumeState\n\n  constructor(key: string) {\n    super()\n    this.key = key\n  }\n\n  subscribeToResumeState(provider: ElectricProvider): () => void {\n    const resumeStateHandler = provider.on(`resumeState`, this.save.bind(this))\n    return () => provider.off(`resumeState`, resumeStateHandler)\n  }\n\n  save(resumeState: ResumeState) {\n    const jsonPart = JSON.stringify({\n      operations: resumeState.document,\n      awareness: resumeState.awareness,\n    })\n    localStorage.setItem(this.key, jsonPart)\n\n    if (resumeState.stableStateVector) {\n      const vectorBase64 = buffer.toBase64(resumeState.stableStateVector)\n      localStorage.setItem(`${this.key}_vector`, vectorBase64)\n    } else {\n      // ensure vector is removed\n      localStorage.removeItem(`${this.key}_vector`)\n    }\n  }\n\n  load(): ResumeState {\n    if (this.resumeState) {\n      return this.resumeState\n    }\n\n    const jsonData = localStorage.getItem(this.key)\n    if (!jsonData) {\n      this.emit(`synced`, [{}])\n    } else {\n      this.resumeState = JSON.parse(jsonData)\n\n      const vectorData = localStorage.getItem(`${this.key}_vector`)\n      if (vectorData) {\n        this.resumeState!.stableStateVector = buffer.fromBase64(vectorData)\n      }\n\n      this.emit(`synced`, [this.resumeState!])\n    }\n\n    return this.resumeState!\n  }\n}\n","import * as decoding from 'lib0/decoding'\n\n/**\n * Convert a hex string from PostgreSQL's bytea format to a Uint8Array\n */\nconst hexStringToUint8Array = (hexString: string) => {\n  const cleanHexString = hexString.startsWith(`\\\\x`)\n    ? hexString.slice(2)\n    : hexString\n  return new Uint8Array(\n    cleanHexString.match(/.{1,2}/g)!.map((byte) => parseInt(byte, 16))\n  )\n}\n\n/**\n * Utility to parse hex string bytea data to a decoder for YJS operations\n */\nexport const parseToDecoder = {\n  bytea: (hexString: string) => {\n    const uint8Array = hexStringToUint8Array(hexString)\n    return decoding.createDecoder(uint8Array)\n  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